Sorry guys, I was only joking around. The load is, as Dan said, on the tuner - well the decompression chip, not the CPU. So more channels, whether on the same mux or others won't effect the CPU. Actually recording it is just streaming the encoded (not decoded) transport stream to disk, and even in the most extreme case DVB-T only supports upto 20Mb/s over an entire mux (from memory). So in totallymaxed case in the UK, this is a max of 6x20 - 15MB/s which even the slowest of disks can handly, it is not likely to present any real load to the CPU! Of course if many of these streams are being sent over your network to MDs, then it would present an increasing load on the network..
Totallymaxed - when you have upto 14 channels, unless a lot were radio, I can't imagine that the TV quality would be too great. In AU most SD channels are transmitted between 5-6Mb/s and the HD channels between 9-12Mb/s... what is your impression of the quality of TV when there are a lot on the same mux?